|
| | Abstract | | The authors have started a research and development on non destructive measurements of the pavement using GPR and high-frequency surface wave method. First, we conducted a parameter study on the surface pavement structure to the responses of dispersion curves of surface waves or reflectivity of electromagnetic waves. Based on the parameter study, a preliminary field measurement was carried out on a pavement where cracks and wheel ruts were obvious. Comparative measurement was also conducted on a pavement where surface evidences were not apparent. GPR measurements using an 800 MHz antenna system successfully identified flexure and subsidence of subbase just beneath the ruts. Common shot records and their dispersion curves of the surface wave surveys showed distinct differences in the line directions to the ruts and cracks. The surface wave surveys showed it was essential to obtain high frequency waveforms at least 2 kHz or more for analyzing the pavement structure and its characterization. |
|
|
|
| |
|